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Removing 1.5" for lav sink..tying into new 2" for garage sink

10-25-2012, 08:49 AM

I'm rethinking my garage utility sink install. I posted a question a few weeks ago concerning that. My initial thought was to tie into the existing lav sink drain by removing drywall in the garage and installing a San-T in the exist drain kind of like below:

Re: Removing 1.5&quot; for lav sink..tying into new 2&quot; for garage sink

Now my plan is to go into basement and cut out the majority of the existing 1.5" for the lav sink. Then run all 2" to the laundry sink in the garage and then pick up the lav sink with a 2 x 2 x 1.5 wye.

Note: the utility sink in the garage will use an AVV for venting which is permissible where I live.

Comment

Re: Removing 1.5&quot; for lav sink..tying into new 2&quot; for garage sink

I think that looks good. Just make sure it has 1/4" of slope. Some Codes require you to roll the "wye" up off of center. The lav. coming in higher is a good idea, because it will help keep the line cleaner. Great pictures. Wish I had a Basement. LUCKY.

Comment

Re: Removing 1.5&quot; for lav sink..tying into new 2&quot; for garage sink

looks good. your first idea about the stacking tee/ wet venting was not legal.

the first idea would have been fine to replace the 1.5 with 2'', then install a wye on the riser to pick up the lav off the 2x 1.5 wye branch. continue up on the laundry and reconnect the venting 6'' or greater above the lav overflow. this way the venting is legal and you're not using an aav. nh master would be proud of you.

Comment

Re: Removing 1.5&quot; for lav sink..tying into new 2&quot; for garage sink

UPC would require you to run the horizontal waste in 2", terminating with 2x1-1/2 combo and a clean out. Also, you should test it for leaks. I'm not going to tell you the easy way to do that because I'm curious to see how you would accomplish a test without any help.

all you need to do is install the san tee off a wye branch and continue up with the vent.

like this? where fitting "G" is picking up the laundry sink in garage? Only problem with that is that below San-T "A", where it drops into the basement shown in post #2, the drain is all 1.5". And like Plumbus pointed out I want all 2" for the laundry sink

UPC would require you to run the horizontal waste in 2", terminating with 2x1-1/2 combo and a clean out. Also, you should test it for leaks. I'm not going to tell you the easy way to do that because I'm curious to see how you would accomplish a test without any help.

much better. yes you do need 2'' from the common tee of the laundry and sink. your venting is correct now

nh master might be happy

rick.

I'm not doing it this way as shown above because the laundry sink would still drain into 1'5" once it reaches the existing lav drain.

So the way I'm doing it is I'm cutting out the existing 1.5" for the lav drain in the basement....like shown in post #2 and running new 2" to the garage utility sink location. I will then....in the basement.... tie into the new 2" with the existing 1.5" lav drain.

Comment

Re: Removing 1.5&quot; for lav sink..tying into new 2&quot; for garage sink

The 2" that I configured in post #2, I lifted kind of into position in the basement to show what I want to do. The existing 1.5" lav drain will be cut out from where I put the green "X" all the way back to the stack in the basement. The remaing 1'5" remaining will be joined the the 1.5" 45 labeled as fitting "H". Thats how the exist lav drain will tie back into the new 2" that I will run..